the nra might say you're just taking guns out of the hands of the good guys. >> well shgs , they said that what we need are more good guys with guns. well, there are a lot of good guys with guns. we have more good guys with guns than any place in the world, and we also have more gun violence. >> reporter: guns likely to be used in crimes are unlikely to be turned in at gun buy-backs. the mayor said since 2009, los angeles has collected 8,000 guns at buy-backs, a period in which violent crime in the city has dropped by 33%. >> this is part of a much bigger effort, a comprehensive effort to address gun and gang violence. and like i said in the city of la, the proof is in the pudding. >> reporter: the line of cars stretched for 6 blocks as people waited up to three hours to turn in their guns. >> it's my sympathy card to connecticut. >> reporter: many people are turning in their guns here that land officials expect this to be -- that lapd officials expect this to be their most successful buy-back ever. >>> president obama will spend the night aboard airforce 1 making a red-eye trip from